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I have a 2008 RAM with a V6 and automatic tranny, but as far as I can remember, when it is slowing down (with my foot off the gas pedal), it downshifts from one gear to the next lower one, and as it does, it actually revs up to about 1400 RPM for an instant, and then returns to idle.

Many thanks for all your replies, and the information you have listed within them. Unfortunately, I had already taken the truck to the local dealer, but although their mechanic said it was fine, he could not explain why the engine was upreving during the downshifts, or why other trucks did not do the same. So I realized that the dealer was just trying to shove me out because it was an unprofitable situation for them, since they did not know what to do about it, and thus had no way to charge the manufacturer.

On the other hand, the truck does behave the same whether the towing option is On or Off, so unless this option is actually stuck On, and still displays the Off setting (Is this possible?), the towing option makes no difference.

Lastly, what concerns me is not that the transmission downshifts when I slow down, all automatic trannies do that, but what I do not understand is why would this one back-drive the engine, making it uprev every time the next lower gear is engaged. Is there anything different from standard about the torque converter in these trucks (2008 RAM with a V6 and automatic tranny) which could be making mine act up? Do you have any other suggestions? Please do let me know.